Russian authorities have identified the second Moscow Metro suicide bomber as a 28-year-old woman from the volatile region of Dagestan.
"The terrorist who blew herself up at the Lubyanka Metro station was Mariam Sharipova, who was born in 1982," said a spokesman for Russia's FSB security service.
Forty people were killed and dozens more injured when two bombs were detonated on the Russian capital's vast underground system last Monday.
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On Friday, the National Anti-Terror Committee (NAK) named Dzhennet Abdurakhmanova, the 17-year-old widow of an Islamist militant, as one of the bombers.
Vow to hunt down attackers
The Islamist group "Emirate of the Caucasus", which is waging an insurgency to impose a Sharia-law based state in the North Caucasus, has claimed responsibility for the Moscow attacks.
Its leader, Doku Umarov, said in a video posted on the kavkazcenter.com website that he personally ordered the strikes.
Russian President Dmitry Medvedev and Prime Minister Vladimir Putin have both called for those behind the deadly bombings to be hunted down.
The attacks have sent a chill across Russia, recalling a string of suicide attacks carried out several years ago by the so-called "Black Widows", women whose relatives had been killed by Russian forces.
